After 5000 music-lovin' I/O attendees warmed up Google's servers, it appears that the company has now finished its presumed installation of four zillion exabytes of new hard drive capacity. We're exaggerating, obviously, but probably not by much -- we've received a flood of tips today (as well as an invite amongst ourselves) noting that Music Beta is finally being opened up to Earthlings in the "real world." Specifically, Motorola Xoom owners. In case you've forgotten, that entitles you to free
